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Re: Array indexing: what is IDL doing? [message #60722 is a reply to message #60711]

Sat, 07 June 2008 06:12

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

> So I want to pull out a small subsection from within a larger idl
> array. I want to do something like this:
>
> bigarr = findgen(500,100000)
> bigx = [indgen(50)+100,indgen(25)+200]
> bigy = indgen(10000)+50000
>
> res = bigarr[bigx,bigy]

In the particular case above, I would expect that this would be most
efficient:

res = [bigarr[100:149,50000:59999], bigarr[200:224,50000:59999]]

Of course, that's only going to work when you know a priori that
everything will be in a relatively small number of chunks.

-Jeremy.

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[Message index]

		Re: Array indexing: what is IDL doing? By: Conor on Tue, 10 June 2008 07:16
		Re: Array indexing: what is IDL doing? By: Jean H. on Mon, 09 June 2008 10:12
		Re: Array indexing: what is IDL doing? By: Heinz Stege on Mon, 09 June 2008 08:34
		Re: Array indexing: what is IDL doing? By: Conor on Mon, 09 June 2008 06:02
		Re: Array indexing: what is IDL doing? By: Conor on Mon, 09 June 2008 05:56
		Re: Array indexing: what is IDL doing? By: Jeremy Bailin on Sat, 07 June 2008 06:12
		Re: Array indexing: what is IDL doing? By: Jean H. on Fri, 06 June 2008 14:15

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